function set_os_image(os_type)
{ 
    var x=os_type.indexOf('Vista');
    if(x>-1)
	{
	 
     document.getElementById("os_image").style.visibility="visible";
    }
	else
	{
	  
     document.getElementById("os_image").style.visibility="hidden";
    } 
	
 
	 var y=os_type.indexOf('MAC');
    if(y>-1)
	{
	 
     document.getElementById("os_title_win").style.visibility="hidden";
	 document.getElementById("os_title_mac").style.visibility="visible";
    }
	else
	{
	 document.getElementById("os_title_win").style.visibility="visible";
	 document.getElementById("os_title_mac").style.visibility="hidden";
    }  
};

function os_image_class(os_type)
{ 
    var x=os_type.indexOf('MAC');
    if(x>-1)
	{
	 
     return "mac";
    }
	else
	{
	  
     return "win";
    }
 
};

function tabit(btn){
	var idname = new String(btn.id);
	var s = idname.indexOf("_");
	var e = idname.lastIndexOf("_")+1;
	var tabName = idname.substr(0, s);
	var id = parseInt(idname.substr(e, 1));
	var tabNumber = btn.parentNode.childNodes.length;
	for(i=0;i<tabNumber;i++){
			//document.getElementById(tabName+"_div_"+i).style.display = "none";
			document.getElementById(tabName+"_btn_"+i).className = "";
		};
		//document.getElementById(tabName+"_div_"+id).style.display = "block";
		btn.className = "curr";
};

function etabit(btn){
	var idname = new String(btn.id);
	var s = idname.indexOf("_");
	var e = idname.lastIndexOf("_")+1;
	var tabName = idname.substr(0, s);
	var id = parseInt(idname.substr(e, 1));
	var tabNumber = btn.parentNode.childNodes.length;
	for(i=0;i<tabNumber;i++){
			document.getElementById(tabName+"_div_"+i).style.display = "none";
			document.getElementById(tabName+"_btn_"+i).className = "";
		};
		document.getElementById(tabName+"_div_"+id).style.display = "block";
		btn.className = "curr";
};